package com.nuaa.community.controller;

import com.nuaa.community.entity.Event;
import com.nuaa.community.entity.Page;
import com.nuaa.community.entity.User;
import com.nuaa.community.event.EventProducer;
import com.nuaa.community.service.FollowService;
import com.nuaa.community.util.CommunityConstant;
import com.nuaa.community.util.CommunityUtil;
import com.nuaa.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

/**
 * ClassName: FollowController
 * Package: com.nuaa.community.controller
 * Description:
 */
@Controller
public class FollowController implements CommunityConstant {

    @Autowired
    private FollowService followService;

    @Autowired
    private HostHolder hostHolder;

    @Autowired
    private EventProducer eventProducer;

    /**
     * 关注
     * @param entityType
     * @param entityId
     * @return
     */
    @PostMapping(path = "/follow")
    @ResponseBody
    public String follow (int entityType, int entityId) {
        User user = hostHolder.getUser();
        followService.follow(user.getId(), entityType, entityId);

        // 触发关注事件
        Event event = new Event()
                .setTopic(TOPIC_FOLLOW)
                .setUserId(user.getId())
                .setEntityType(entityType)
                .setEntityId(entityId)
                .setEntityUserId(entityId);
        eventProducer.fireEvent(event);

        return CommunityUtil.getJSONString(0, "已关注");
    }

    /**
     * 取消关注
     * @param entityType
     * @param entityId
     * @return
     */
    @PostMapping(path = "/unfollow")
    @ResponseBody
    public String unfollow (int entityType, int entityId) {
        User user = hostHolder.getUser();
        followService.unfollow(user.getId(), entityType,entityId);
        return CommunityUtil.getJSONString(0, "已取消关注");
    }

    /**
     * 查询某个用户的关注列表
     * @param userId
     * @param page
     * @param model
     * @return
     */
    @GetMapping(path = "/followees/{userId}")
    public String getFollowees (@PathVariable("userId") int userId, Page page, Model model) {
        User user = hostHolder.getUser();
        if (user == null){
            throw new RuntimeException("该用户不存在！");
        }
        model.addAttribute("user", user);
        page.setLimit(5);
        page.setPath("/followees/" + userId);
        page.setRows((int)followService.findFolloweeCount(userId, ENTITY_TYPE_USER));
        List<Map<String, Object>> userList = followService.findFollowees(userId, page.getOffset(), page.getLimit());
        if (userList != null){
            for (Map<String, Object> map : userList) {
                User u = (User) map.get("user");
                map.put("hasFollowed", hasFollowed(u.getId()));
            }
        }
        model.addAttribute("users", userList);
        return "site/followee";
    }

    private boolean hasFollowed (int userId) {
        if (hostHolder.getUser() == null){
            return false;
        }
        return followService.hasFollowed(hostHolder.getUser().getId(), ENTITY_TYPE_USER,userId);
    }

    /**
     * 查询某个用户的关注列表
     * @param userId
     * @param page
     * @param model
     * @return
     */
    @GetMapping(path = "/followers/{userId}")
    public String getFollowers (@PathVariable("userId") int userId, Page page, Model model) {
        User user = hostHolder.getUser();
        if (user == null){
            throw new RuntimeException("该用户不存在！");
        }
        model.addAttribute("user", user);
        page.setLimit(5);
        page.setPath("/followers/" + userId);
        page.setRows((int)followService.findFollowerCount(ENTITY_TYPE_USER, userId));
        List<Map<String, Object>> userList = followService.findFollowers(userId, page.getOffset(), page.getLimit());
        if (userList != null){
            for (Map<String, Object> map : userList) {
                User u = (User) map.get("user");
                map.put("hasFollowed", hasFollowed(u.getId()));
            }
        }
        model.addAttribute("users", userList);
        return "site/follower";
    }

}
